Modern Mining May 2017

PRODUCT News

Hoist drive from SA ordered by Canadian mine magnitude before. It is a real feather in our cap, especially seeing we were awarded the project by a leading competitor, which gives us a good foot in the door in securing future orders.”

million Nm, as opposed to 475 000 Nm for the largest X-Series industrial gear unit produced by SEW-EURODRIVE to date. Due to the high torque requirements, the OEM was also able to assist with special tangen- tial keys on the output shaft. “The application of the hoist drive is to convey both mineworkers and goods, which meant that strict health and safety requirements and safety factors had to be accommodated,” notes Swanepoel. This also meant that a much higher service fac- tor had to be taken into consideration. SEW-EURODRIVE South Africa has sub- sequently clinched a major order for the second stage of the project, a ML Series unit for a goods-only application, which is currently being assembled at the OEM’s manufacturing facility in China to interna- tional DIN standards. The power rating of this second hoist drive is 1 000 kW, with a nominal torque of 293 000 kNm. “The second unit is going to the same mine but the application is a goods-only hoist lift in a deeper underground sec- tion for ore transportation. This is also a one-off order, with special attention paid to the service factor and maintainability in order to increase its cost-effectiveness,” Swanepoel explains. The second unit, which has a mass of about 11 t, will have a

A 24-t ZDN hoist drive, representing one of the largest single units from SEW- EURODRIVE South Africa to date, is to be supplied to a mine in Canada for a hoist- ing application. Traditionally known as specialising in smaller geared motors for conveyor applications, SEW-EURODRIVE has the capability to manufacture custom components up to the size and complexity of girth gears. The order for the fast-track project was received in December 2016, with the initial kick-off meeting held in January 2017, says Rudi Swanepoel, the company’s Head of Projects.“To the best of my knowledge, this is the biggest unit that SEW-EURODRIVE South Africa has ever supplied. In my expe- rience, I have never quoted on a unit of this

international OEMs, benefit significantly through access to an independent bal- ancing service offering with this level of capacity and quality.” The HM7 U/S balancing machine has a measuring range between 100 and 5 000 rpm. It is 9m long, has a journal size of 400 mm and a swing of 2,4 m. The machine is fitted with a CAB 920 H computer mea- suring system with advanced functionality. “This state-of-the-art technology makes changeovers to new rotor types quick and straightforward, and the machine is capable of balancing larger high-speed rotors dynamically at full operating speed,” Chamberlain says. He adds that, on occa- sion, and depending on the design of the rotor and the individual customer require- ment, balancing can be done at 10 % overspeed or more if required. The global presence of SEW-EURODRIVE is another major factor which contributed to the company securing this flagship proj- ect, with the ZDN 3 HSN 1670 hoist drive being designed and manufactured in the Czech Republic. The hoist drive has two input shafts, driven by two 1 000 kW motors, driving helical bevel gears that, in turn, drive the single output shaft of the gearbox, and thereby the specific hoisting applica- tion. “The reason we had to do this was in order to comply with the specific require- ments of the customer, who is looking to standardise on 1 000 kW units on-site,” Swanepoel says. “This means a more streamlined and cost-effective stockhold- ing for all applications.” The hoist drive features special oil cool- ers fitted for thermal and heat dissipation, including additional auxiliary equipment. Heat dissipation is a critical consideration, because the higher the kilowatt rating, the higher the required thermal rating of the gearbox will be, which calls for additional cooling. The huge amount of torque generated on the output shaft is an astonishing ±1,5

24-week delivery period. SEW-Eurodrive, tel (+27 11) 248-7000

The ZDN 3 HSN 1670 hoist drive.

Precision balancing of rotating machines As the operator of the largest independent high speed dynamic balancing machine in sub-Saharan Africa, Marthinusen & Coutts, a division of ACTOM, has an in-depth understanding of the importance of preci- sion-balancing rotating machines.

Marthinusen & Coutts also performs on site vibration and dynamic balancing with its recently acquired Bently Nevada ADRE 408 portable vibration and balancing system. Marthinusen & Coutts, tel (+27 11) 607-1700

Mike Chamberlain, marketing and commercial executive at this leading local repairer of rotating electrical and mechani- cal equipment, points out how critical it is to ensure the highest degree of accuracy when balancing rotating machines as this will minimise vibration levels, thereby increasing reliability and reducing mainte- nance costs. The 32-ton Schenck HM7 U/S balancing machine, located at Marthinusen & Coutts’ 9 500 m² high- tech workshop in Cleveland, near Johannesburg, is in constant use. “Our customers, which include major local and

Marthinusen & Coutts operates the largest inde- pendent high speed dynamic balancing machine in sub-Saharan Africa.

50  MODERN MINING  May 2017